Most 6 bolt ....
...Bellhousings will be for wide bolt pattern trans mounting.
But just a quick note,
the thing you need to look out for, when looking for a bellhousing, is the Starter position,
and THIS starts the learning curve of 6 bolt bellhousings, and parts to make it all work.
The Starter position needs to match the flywheel size/tooth count.
(and the starter needs to match the bellhousing/flywheel...)
The common 6 bolt bellhousing flywheels are 157 or 164 teeth.
It's tough, at a glance, to know what the starter position is, on any given 6 bolt bellhousing.
And then there is the block plate that goes between the engine block and bellhousing, that needs to match the bellhousing.
I'll let you continue the learning, elsewhere.